[Plugin: Post Tiles] How to randomize the order of the posts.

Hi,

I am totally loving this plugin but I am trying to figure out how to edit the php code to make the posts appear randomized. Example: PostA, PostB and PostC are my posts. I don’t want to give them any advantage over another so I want them to be randomized everysingle time the visitor reloads the page.

Here’s the link to the code:
Dropbox: https://dl.dropbox.com/u/381569/post-tiles.php
Pastebin: https://pastebin.com/sd9egHAi

Thanks in advance